Turn on -Wdelete-non-virtual-dtor for chromeos as well.

build/common.gypi

 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1335 matching lines @@
                   # http://code.google.com/p/googletest/source/detail?r=446 .
                   # TODO(thakis): Use -isystem instead (http://crbug.com/58751 )
                   '-Wno-unnamed-type-template-args',
                 ],
                 'cflags!': [
                   # Clang doesn't seem to know know this flag.
                   '-mfpmath=sse',
                 ],
               }]],
           }],
-          ['clang==1 and chromeos==1', {
-            'target_conditions': [
-              ['_toolset=="target"', {
-                'cflags': [
-                  # TODO(thakis): Remove this once all instances of this
-                  # are fixed in the views and chromeos code.
-                  # http://crbug.com/84424
-                  # TODO(thakis): Add back in when rolling clang past r131989
-                  '-Wno-delete-non-virtual-dtor',
-                ],
-              }]],
-          }],
           ['clang==1 and clang_use_chrome_plugins==1', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
                   '<(clang_chrome_plugins_flags)',
                 ],
               }]],
           }],
           ['clang==1 and clang_load!="" and clang_add_plugin!=""', {
             'target_conditions': [
@@ skipping 398 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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